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List of Articles
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Open Access Article
1 - The Laboratory study of the effect of the effective stress on decrease of permeability of the Urmia Earthfill Dam Central Clayey Core, Using the Flexible Wall Permeability apparatus
siyamak zadkarimi Kazem Bado -
Open Access Article
2 - Study of Air Contamination Spring from “Uromia Cement Factory”
farhad Gazi -
Open Access Article
3 - Monitoring Urmia Shahr- Chai Dam by the Results of Instrument Monitoring after first Impoundment
mohammad nabati Mirali mohammadi Safety of a dam depends upon not only design and construction but also on the monitoring at the early years after impoundment. Shahr- Chai Dam is located on the Shahr- Chai river and 12 Km away from Urmia city in the south- west. The construction of dam was ended More Safety of a dam depends upon not only design and construction but also on the monitoring at the early years after impoundment. Shahr- Chai Dam is located on the Shahr- Chai river and 12 Km away from Urmia city in the south- west. The construction of dam was ended in winter 2004, and then both of the dam impoundment and monitoring instrument readings were started, immediately. After ending dam construction and the first impoundment, different Phenomenon may appear. This paper presents the general condition of dam by using the results of Piezometers installed in foundation and body part of the dam. On the basis of the Piezometer reading results, after nine months from the first impoundment, When the reservoir level of the dam was maximum, the pressure figure in foundation was recorded as 313.67 KPa and on the core was 109.7 PKa. In the meantime, settlement was recorded 16 cm, approximately. In addition, the results ratifies that the general performance behavior of the Shahr- Chai dam, both in foundation and core, is found to be acceptable. It does not illustrate any hydraulics failure and material inflation Phenomenon, any where. Manuscript profile -
Open Access Article
4 - Uplift Response of Buried pipes in Saturated Sand Using Finite Element Method
jamal seydi Alireza gitaseIn this research a numerical analysis using PLAXIS program has been carried out to investigate the behavior of buried concrete box culverts different parameters including load types, loading locations, culvert dimensions, underlying soil specifications, and the coeffici MoreIn this research a numerical analysis using PLAXIS program has been carried out to investigate the behavior of buried concrete box culverts different parameters including load types, loading locations, culvert dimensions, underlying soil specifications, and the coefficient of earth pressure- at- rest. For modeling purpose, patch loading of rtuck or military tank has been substituted to an equivalent strip load, and the problem has been analyzed under plane strain with application of linear elastic constitutive model. The result of numerical analysis showed that load location has a considerable effect on the produced moment and shear amounts in the culvert and the most critical case is under the tank loading. The location of maximum Shear and negative moment (positive in PLAXIS results) is at the corner of box culvert, and the location of maximum Shear and positive moment (negative in PLAXIS results) is at the center of upper and lower slab the box culvert. By increasing the box culverts dimensions, the moment and Shear amount Will be increased Significantly. By increasing the elasticity modulus of underlying Soil, moments Will be increased and Shears Will be decreased. The variation of Poisson’s ratio has a little effect on box culvert behavior in terms of Shear and moment. By increasing the side Soil’s coefficient of earth pressure- at- rest of side, the maximum Shear and negative moment (Positive in PLAXIS results) decreased , and Positive moment (negative in PLAXIS results) increased. Finally, the results of linear elastic model are compared With Mohr- Coulomb model, and a good agreement has been obtained: therefore, Considering the assumption of linear elastic behavior for soil is almost good assumption and the results have a good precision. Manuscript profile -
Open Access Article
5 - Improving multilayer back propagation neural networks by using variable learning rate and automata theory and determining optimum learning rate
mohammadreza jafariyan Alireza AbaszadehMultilayer Bach propagation neural networks have been considered by researchers. Despite their outstanding success in managing contact between input and output, they have had several drawbacks. For example the time needed for the training of these neural networks is lon MoreMultilayer Bach propagation neural networks have been considered by researchers. Despite their outstanding success in managing contact between input and output, they have had several drawbacks. For example the time needed for the training of these neural networks is long, and some times not to be teachable. The reason For this long time of teaching is due to the selection unsuitable network parameters. The method For Obtaining the network parameters Of bias and weight is using is using gradient network energy function. As we Know, network error Function is of a not flat level, So the network is stopped at some optimum local points and we have no instruction at this points. To compensate for returned algorithm drawbacks, we use adaptive variable learning rate to enhance learning rate and in order to avoiding our network trapping in local points we used automata algorithm. By using this method it is possible to obtain improved learning rate For different net works. Manuscript profile -
Open Access Article
6 - Studying Risk of Flood in Hydrologycal and Water Resources Engineering Projects
jamil Ghaderi Mohammadreza behfarozStudying Risk and Frequency analysis of Flood is done in order to design structures located in Floody lands. In hydrological and water resources engineering projects, first of all, we Should determine frequency of this phenomenon- their return period. In this research, MoreStudying Risk and Frequency analysis of Flood is done in order to design structures located in Floody lands. In hydrological and water resources engineering projects, first of all, we Should determine frequency of this phenomenon- their return period. In this research, the method of planning, the cumulative freguency curve is explained and probability and return period and errors concerning small quantities of probability are discussed. In addition, the application of probability theory about risk of flood in hydrological and water resources projects Will be investigated. A table and diagram is designed and presented to describe return period according to expected life of the plan for different levels of probability. Manuscript profile -
Open Access Article
7 - The effect of slippery friction damper on controlling the response of the structure
masood asgari Ali yosefiyeBraced frames structures have a good lateral stiffness against earthquakes. However, energy loss of their members is slight and strong forces are given to the structures. Moment frames have a more flexible function against earthquakes and also have a better flexibility MoreBraced frames structures have a good lateral stiffness against earthquakes. However, energy loss of their members is slight and strong forces are given to the structures. Moment frames have a more flexible function against earthquakes and also have a better flexibility than braced frames. However, since its lateral stiffness is low, too much displacement of the structure results in an increase in lateral movement in stories. Slippery friction damper system creates a good lateral stiffness for the structure; furthermore it leads to a great energy loss in the structure. In this research, Using SAP2000 this systems behavior has been investigated. Afterwards, it has been compared With the other seismic strengthening systems. Manuscript profile -
Open Access Article
8 - Settlement Analysis Of Embankment Dams with Numerical Analytics Geo_ Slope
kamal rahmani Saber piroti Arasto ArmaganiThe first thing that is vital in the modern embankment dams Construction, it is the correct and monitoring of the geotechniqual constructions. From the experimental results in this work is determination of rules that can help us in performing of the future works. Now, i MoreThe first thing that is vital in the modern embankment dams Construction, it is the correct and monitoring of the geotechniqual constructions. From the experimental results in this work is determination of rules that can help us in performing of the future works. Now, it is considered that inverted analysis method is a very useful tool for understanding the behavior of dam in the hand of engineeres. By investigation of data and using inverted deciding in construction of dams. In this paper monitoring of Mahabad dams With using acculate tools information and numerical analytic has considered. In performing of numerical analytic, it is used by Geo Slope Software package that is a analytic software base on finite element method. By helping in convey of data and performing inverted analysis, condition of Mahabad embankment dams has analysed. While it is more than thirty years form the dams, in the beginning of the construction of this dam, has considered the unusul settlements and horizontal displacements. As foundation settlement up to ending of performing operation (from 1344 to 1348), has measured 125 cm and during exploitation (from 1349 to 1376), has measured 70 cm. From the time of construction, the maximum settlement and horizontal displacement are measured 140 cm and 110 cm respectively. After construction cutoff walls and finishing operation injection in foundation of dam, rate of seepage from foundation is decreased too and according to the numerical calculations in negligible extent is (0.04 centimeter cube in minute) and rate of seepage in body dam is (7.5 centimeter cube in minute). Manuscript profile -
Open Access Article
9 - Ultimate Flexural Strength of Plate Girders Under the Effect of Weld Crack in Flange Toe
farhad farhidi mohammadzadeh Hosein shokati Noroz seyfiThe plate girders are used in important structural systems. The earlier design of plate girders was restricted to their critical bukling capacity. Experimental and theoretical studies show the plate girders with vertical stiffners can carry load over than their critical MoreThe plate girders are used in important structural systems. The earlier design of plate girders was restricted to their critical bukling capacity. Experimental and theoretical studies show the plate girders with vertical stiffners can carry load over than their critical buckling loads and then in modern design codes is permitted to use post- buckling capacity of them. In this case the out- of- plane bending stresses is associated in web panel and then some fatigue cracks may appear under the effect of cyclic loading. In this paper the influence of cracks in weld toe of flange is investigated using nonlinear finite elament analysis of the models of vertically stiffened plate girders. The ultimate bending capacity of beams is estimated using the well know finite element code of LUSAS. The effect of crack length, ratio of web slenderness and crack location are investigated in this study. The ultimate capacity of such plate girders is calculated under initial geometric imperfections. The obtained results in this study show that cracks With length of 30 cm can reduce maximum 18% in ultimate bending capacity. Also the results are compared With the recommendations of the modern design code of ALSC- LRFD. Manuscript profile -
Open Access Article
10 - Influence of effective parameters in optimum distance of two parallel tunnels
said aslanpourConstruction a new tunnel parallel to pre existing tunnel is one of the most complex problems in tunneling. In most engineering projects such as highway and water supply networks, it is essential to construct a new tunnel parallel to existing tunnel. New tunnel causes i MoreConstruction a new tunnel parallel to pre existing tunnel is one of the most complex problems in tunneling. In most engineering projects such as highway and water supply networks, it is essential to construct a new tunnel parallel to existing tunnel. New tunnel causes increasing bending moment in tunnel lining. Increasing the distance of two tunnels, decreases the increasing bending moment. Optimum distance of the tunnels is the distance that new tunnel has no effect in old tunnel. This research studies the influence of parameters that affect optimum distance. Finite difference method is used for analysis of problem. Results Show that at rest earth pressure has maximum effect and tunnel diameter, lining elasticity, cohesion and friction of media and elasticity of media affect the optimum distance. Manuscript profile -
Open Access Article
11 - Neural Network Controller for Nonlinear Benchmark Structures Subjected to Near- Field Ground Motions
arash mosavi Abdolrehem jalali
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